He was a decorated veteran and a member of the Guinea Pig Club, an association that focused on the treatment, rehabilitation and socialization of airmen who suffered serious injuries in the war.
He would later earn a reward of 5000 crowns for his improvement proposal for the Zlin Z-XII aircraft, but he preferred pilot training.
He mastered combat training, served in aviation units and in September 1938 was at the field airport in Ivanovice among the prepared crews.
They landed in Marseille on 25 April, briefly served at an airport near Bordeaux, but did not intervene in the ongoing fighting for France, and on 21 June were on their way to the English coast.
He belonged to a few MS. pilots who participated in the crossing of the Alps with subsequent bombing of the industrial Italian city of Turin.
On 28 December 1941, a six-member crew of 311 Squadron had to make a rough emergency landing in the North Sea after damage to the plane KX-B after the bombing of Wilhelmshaven.
[4] The planes dropped parcels full of resources, but due to the rough sea, the crew members did not dare go into the water to retrieve the packages.
Due to poor health and no help in sight, Šiška and the crew members contemplated suicide[4] but decided against it as they had no means to carry out the deed and did not want to do it by self-drowning.
Out of the six original crew members, Alois Šiška, Pavel Svoboda, and Josef Ščerba were the only ones to survive.
This experience and his subsequent apparent clinical death ultimately saved his feet from amputation, but he could not walk until after the war when he underwent multiple surgeries to help repair the damage.
After liberation, Šiška underwent 14 spine and leg surgeries at the Queen Victoria Hospital, East Grinstead, thereby gaining membership of the Guinea Pig Club.
For instance, on 17 October 2012, a monument was unveiled in Petten, Holland, in honor of the Czech crew of the Wellington KX-B plane that went down in the North Sea on 28 December 1941.